Xen Hypervisor xenstored Write Saturation DoS (XSA-206)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Xen hypervisor installation is missing a security update.

Description :

According to its self-reported version number, the Xen hypervisor
installed on the remote host is affected by a denial of service
vulnerability in xenstored during processing of transactions. An
attacker on the guest can exploit this vulnerability by issuing
repeated writes to xenstore that conflict with transactions either of
the toolstack or backends, such as the driver domain, causing the
transactions made by these entities to fail indefinitely.

Note that Nessus has checked the changeset versions based on the
xen.git change log. Nessus did not check guest hardware configurations
or if patches were applied manually to the source code before a
recompile and reinstall.

See also :

https://xenbits.xen.org/xsa/advisory-206.html
https://xenbits.xen.org/gitweb/?p=xen.git;a=summary

Solution :

Apply the appropriate patch according to the vendor advisory.

Risk factor :

Low / CVSS Base Score : 1.9
(CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 1.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Misc.

Nessus Plugin ID: 99398 ()

Bugtraq ID: 97250

CVE ID:

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